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Prime Minister John Key says he'll vote in favour a bill to allow marriage equality for same-sex couples because it won't impact on his relationship with his wife.

Mr Key said on Radio Live he would use a conscience vote to vote in favour of a bill allowing gay and transgender couples to get married.

He signalled his support for the bill in its early stages, but said he was unlikely to change his mind over the course of the debate to allow same-sex couples to marry - given it was a conscience vote.

"You go through all the merits of the argument and look at what people put up; but my view is that if two gay people want to get married I can't see why it would undermine my marriage with Bronagh," he told Radio Live.

Mr Craig, whose party received 2.65 per cent of the vote in the general election, had committed part of his personal wealth to battling social policy in the past, such as Sue Bradford's anti-smacking bill.